A giant Battenberg cake made of bricks and an outsize blue cockerel have been revealed to be among the works battling to take their place in Trafalgar Square.

Six works are in the running to win a position at what has now become one of Britain's most famous art displays on the London square's fourth plinth.

Also competing for the honour is a church-style pipe organ which would blast sounds across the square each time someone used an attached cashpoint.

The proposals by the six artists were unveiled on Thursday and the winner will replace the current work - Yinka Shonibare's large-scale Nelson's Ship In A Bottle.

Other notable artworks which have featured on the plinth have included Antony Gormley's One & Other last year, which saw 2,400 people taking the space for an hour each to do what they wanted, with some standing naked.

Models created by the hopeful artists of their designs are being displayed until the end of October at St Martin-in-the-Fields church from Thursday.

The works include Allora & Calzadilla's Untitled which is a working cashpoint to be embedded in the plinth which triggers organ pipes placed on the exhibition space above.

Brian Griffiths has designed an enormous Battenberg, the pink and yellow cake created to commemorate Queen Victoria's granddaughter Princess Victoria marrying Prince Louis of Battenberg in 1884. It will be made from vintage and contemporary hand-made bricks.

Katharina Fritsch has proposed her work Hahn/Cock for the spot - a sculpture of a cockerel painted ultramarine blue, designed to symbolise regeneration, awakening and strength.

The selected artist will be announced by mayor of London Boris Johnson early next year.